A grid is usually "bonded" to the hull. Beneteau-US can tell you on Monday but I'd expect this is structural adhesive or epoxy
of some kind.
to the grid would be a conventional fiberglass repair
, i.e. grind back the edges of the crack at the correct angle, layer in new layers of glass, build it back up, same as working on a hull just more complicated when you're trying to work around right angles. Still, small area, simple enough to overbuild the repair
. Aesthetics aside.
That the keel has stayed pushed up may mean the grid was pushed up more than it seems, or the hull pushed up and the grid is now holding it in the wrong position. I suspect that Beneteau would say a "proper" repair
means removing the grid entirely, checking for hull damage and keel alignment, then reinstalling a new grid or repairing and reinstalling the old one, after checking it for proper shape. And since it is the keel, that really might be the only proper way to do it.
An oscillating saw might allow you to cut the old grid free without damaging it, but I'm almost afraid to ask what B would charge to supply a new grid if they still can. As opposed to taking this one to the local auto body shop. (G)